@@ -0,0 +1,171 @@
+/*
+ * Backlight control code for Sharp Zaurus SL-5500
+ *
+ * Copyright 2005 John Lenz <lenz@cs.wisc.edu>
+ * Maintainer: Pavel Machek <pavel@ucw.cz> (unless John wants to :-)
+ * GPL v2
+ *
+ * This driver assumes single CPU. That's okay, because collie is
+ * slightly old hardware, and no one is going to retrofit second CPU to
+ * old PDA.
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/fb.h>
+#include <linux/backlight.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/delay.h>
+#include <linux/mfd/locomo.h>
+
+struct locomo_bl {
+ void __iomem *regs;
+ int current_intensity;
+ int gpio_fl_vr;
+};
+
+static const struct {
+ u16 duty, bpwf;
+ bool vr;
+} locomo_bl_pwm[] = {
+ { 0, 161, false },
+ { 117, 161, false },
+ { 163, 148, false },
+ { 194, 161, false },
+ { 194, 161, true },
+};
+
+static int locomo_bl_set_intensity(struct backlight_device *bd)
+{
+ int intensity = bd->props.brightness;
+ struct locomo_bl *bl = dev_get_drvdata(&bd->dev);
+
+ if (bd->props.power != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (bd->props.fb_blank != FB_BLANK_UNBLANK)
+ intensity = 0;
+ if (bd->props.state & BL_CORE_SUSPENDED)
+ intensity = 0;
+
+ gpio_set_value(bl->gpio_fl_vr, locomo_bl_pwm[intensity].vr);
+
+ writew(locomo_bl_pwm[intensity].bpwf, bl->regs + LOCOMO_ALS);
+ udelay(100);
+ writew(locomo_bl_pwm[intensity].duty, bl->regs + LOCOMO_ALD);
+ udelay(100);
+ writew(locomo_bl_pwm[intensity].bpwf | LOCOMO_ALC_EN,
+ bl->regs + LOCOMO_ALS);
+
+ bl->current_intensity = intensity;
+ if (bd->props.state & BL_CORE_SUSPENDED)
+ writew(0x00, bl->regs + LOCOMO_ALS);
+
+ return 0;
+}
+
+static int locomo_bl_get_intensity(struct backlight_device *bd)
+{
+ struct locomo_bl *bl = dev_get_drvdata(&bd->dev);
+
+ return bl->current_intensity;
+}
+
+static const struct backlight_ops locomo_bl_ops = {
+ .options = BL_CORE_SUSPENDRESUME,
+ .get_brightness = locomo_bl_get_intensity,
+ .update_status = locomo_bl_set_intensity,
+};
+
+static int locomo_bl_probe(struct platform_device *dev)
+{
+ struct backlight_properties props;
+ struct resource *res;
+ struct locomo_bl_platform_data *pdata;
+ struct locomo_bl *bl;
+ struct backlight_device *locomo_bl_device;
+ int rc;
+
+ bl = devm_kmalloc(&dev->dev, sizeof(struct locomo_bl), GFP_KERNEL);
+ if (!bl)
+ return -ENOMEM;
+
+ res = platform_get_resource(dev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+ bl->regs = devm_ioremap_resource(&dev->dev, res);
+ if (!bl->regs)
+ return -EINVAL;
+
+ pdata = dev_get_platdata(&dev->dev);
+ if (!pdata)
+ return -EINVAL;
+
+ bl->gpio_fl_vr = pdata->gpio_fl_vr;
+ rc = devm_gpio_request_one(&dev->dev, bl->gpio_fl_vr,
+ GPIOF_OUT_INIT_LOW, "FL VR");
+ if (rc)
+ return rc;
+
+ writew(0, bl->regs + LOCOMO_ALS);
+ writew(0, bl->regs + LOCOMO_ALD);
+
+ memset(&props, 0, sizeof(struct backlight_properties));
+ props.type = BACKLIGHT_RAW;
+ props.max_brightness = ARRAY_SIZE(locomo_bl_pwm) - 1;
+ props.brightness = props.max_brightness / 2;
+ locomo_bl_device = backlight_device_register("locomo-bl",
+ &dev->dev, bl,
+ &locomo_bl_ops, &props);
+
+ if (IS_ERR(locomo_bl_device))
+ return PTR_ERR(locomo_bl_device);
+
+ platform_set_drvdata(dev, locomo_bl_device);
+
+ /* Set up frontlight so that screen is readable */
+ backlight_update_status(locomo_bl_device);
+
+ return 0;
+}
+
+static int locomo_bl_remove(struct platform_device *dev)
+{
+ struct backlight_device *locomo_bl_device = platform_get_drvdata(dev);
+
+ locomo_bl_device->props.brightness = 0;
+ locomo_bl_device->props.power = 0;
+ locomo_bl_set_intensity(locomo_bl_device);
+
+ backlight_device_unregister(locomo_bl_device);
+
+ return 0;
+}
+
+static void locomo_bl_shutdown(struct platform_device *dev)
+{
+ struct backlight_device *locomo_bl_device = platform_get_drvdata(dev);
+
+ locomo_bl_device->props.brightness = 0;
+ locomo_bl_device->props.power = 0;
+ locomo_bl_set_intensity(locomo_bl_device);
+}
+
+static struct platform_driver locomo_bl_driver = {
+ .driver = {
+ .name = "locomo-backlight",
+ .owner = THIS_MODULE,
+ },
+ .probe = locomo_bl_probe,
+ .remove = locomo_bl_remove,
+ /* Turn off bl on power off/reboot */
+ .shutdown = locomo_bl_shutdown,
+};
+
+module_platform_driver(locomo_bl_driver);
+
+MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>, Pavel Machek <pavel@ucw.cz>");
+MODULE_DESCRIPTION("Collie Backlight driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:locomo-backlight");